gecko/security/nss/lib/ckfw/mutex.c

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2008-06-06 05:40:11 -07:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifdef DEBUG
static const char CVS_ID[] = "@(#) $RCSfile: mutex.c,v $ $Revision: 1.9 $ $Date: 2009/02/09 07:55:52 $";
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#endif /* DEBUG */
/*
* mutex.c
*
* This file implements a mutual-exclusion locking facility for Modules
* using the NSS Cryptoki Framework.
*/
#ifndef CK_T
#include "ck.h"
#endif /* CK_T */
/*
* NSSCKFWMutex
*
* NSSCKFWMutex_Destroy
* NSSCKFWMutex_Lock
* NSSCKFWMutex_Unlock
*
* nssCKFWMutex_Create
* nssCKFWMutex_Destroy
* nssCKFWMutex_Lock
* nssCKFWMutex_Unlock
*
* -- debugging versions only --
* nssCKFWMutex_verifyPointer
*
*/
struct NSSCKFWMutexStr {
PRLock *lock;
};
#ifdef DEBUG
/*
* But first, the pointer-tracking stuff.
*
* NOTE: the pointer-tracking support in NSS/base currently relies
* upon NSPR's CallOnce support. That, however, relies upon NSPR's
* locking, which is tied into the runtime. We need a pointer-tracker
* implementation that uses the locks supplied through C_Initialize.
* That support, however, can be filled in later. So for now, I'll
* just do this routines as no-ops.
*/
static CK_RV
mutex_add_pointer
(
const NSSCKFWMutex *fwMutex
)
{
return CKR_OK;
}
static CK_RV
mutex_remove_pointer
(
const NSSCKFWMutex *fwMutex
)
{
return CKR_OK;
}
NSS_IMPLEMENT CK_RV
nssCKFWMutex_verifyPointer
(
const NSSCKFWMutex *fwMutex
)
{
return CKR_OK;
}
#endif /* DEBUG */
/*
* nssCKFWMutex_Create
*
*/
NSS_EXTERN NSSCKFWMutex *
nssCKFWMutex_Create
(
CK_C_INITIALIZE_ARGS_PTR pInitArgs,
CryptokiLockingState LockingState,
NSSArena *arena,
CK_RV *pError
)
{
NSSCKFWMutex *mutex;
mutex = nss_ZNEW(arena, NSSCKFWMutex);
if (!mutex) {
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*pError = CKR_HOST_MEMORY;
return (NSSCKFWMutex *)NULL;
}
*pError = CKR_OK;
mutex->lock = NULL;
if (LockingState == MultiThreaded) {
mutex->lock = PR_NewLock();
if (!mutex->lock) {
*pError = CKR_HOST_MEMORY; /* we couldn't get the resource */
}
}
if( CKR_OK != *pError ) {
(void)nss_ZFreeIf(mutex);
return (NSSCKFWMutex *)NULL;
}
#ifdef DEBUG
*pError = mutex_add_pointer(mutex);
if( CKR_OK != *pError ) {
if (mutex->lock) {
PR_DestroyLock(mutex->lock);
}
(void)nss_ZFreeIf(mutex);
return (NSSCKFWMutex *)NULL;
}
#endif /* DEBUG */
return mutex;
}
/*
* nssCKFWMutex_Destroy
*
*/
NSS_EXTERN CK_RV
nssCKFWMutex_Destroy
(
NSSCKFWMutex *mutex
)
{
CK_RV rv = CKR_OK;
#ifdef NSSDEBUG
rv = nssCKFWMutex_verifyPointer(mutex);
if( CKR_OK != rv ) {
return rv;
}
#endif /* NSSDEBUG */
if (mutex->lock) {
PR_DestroyLock(mutex->lock);
}
#ifdef DEBUG
(void)mutex_remove_pointer(mutex);
#endif /* DEBUG */
(void)nss_ZFreeIf(mutex);
return rv;
}
/*
* nssCKFWMutex_Lock
*
*/
NSS_EXTERN CK_RV
nssCKFWMutex_Lock
(
NSSCKFWMutex *mutex
)
{
#ifdef NSSDEBUG
CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
if( CKR_OK != rv ) {
return rv;
}
#endif /* NSSDEBUG */
if (mutex->lock) {
PR_Lock(mutex->lock);
}
return CKR_OK;
}
/*
* nssCKFWMutex_Unlock
*
*/
NSS_EXTERN CK_RV
nssCKFWMutex_Unlock
(
NSSCKFWMutex *mutex
)
{
PRStatus nrv;
#ifdef NSSDEBUG
CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
if( CKR_OK != rv ) {
return rv;
}
#endif /* NSSDEBUG */
if (!mutex->lock)
return CKR_OK;
nrv = PR_Unlock(mutex->lock);
/* if unlock fails, either we have a programming error, or we have
* some sort of hardware failure... in either case return CKR_DEVICE_ERROR.
*/
return nrv == PR_SUCCESS ? CKR_OK : CKR_DEVICE_ERROR;
}
/*
* NSSCKFWMutex_Destroy
*
*/
NSS_EXTERN CK_RV
NSSCKFWMutex_Destroy
(
NSSCKFWMutex *mutex
)
{
#ifdef DEBUG
CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
if( CKR_OK != rv ) {
return rv;
}
#endif /* DEBUG */
return nssCKFWMutex_Destroy(mutex);
}
/*
* NSSCKFWMutex_Lock
*
*/
NSS_EXTERN CK_RV
NSSCKFWMutex_Lock
(
NSSCKFWMutex *mutex
)
{
#ifdef DEBUG
CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
if( CKR_OK != rv ) {
return rv;
}
#endif /* DEBUG */
return nssCKFWMutex_Lock(mutex);
}
/*
* NSSCKFWMutex_Unlock
*
*/
NSS_EXTERN CK_RV
NSSCKFWMutex_Unlock
(
NSSCKFWMutex *mutex
)
{
#ifdef DEBUG
CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
if( CKR_OK != rv ) {
return rv;
}
#endif /* DEBUG */
return nssCKFWMutex_Unlock(mutex);
}